A two-input two-output control model of HCCI engines

This paper outlines a 2-input, 2-state control-oriented system model of the residual-affected homogeneous charge compression ignition (HCCI) process. The combustion timing and peak pressure are the model states, while the inducted gas composition and effective compression ratio are the model inputs. In previous work the authors utilized the self-stabilizing characteristic of residual-affected HCCI to neglect the combustion timing dynamics to arrive at a single-input, single-output dynamic model. In this paper the combustion timing dynamics are explicitly included for two reasons: the resulting model is more accurate and allows the simultaneous, coordinated control of both in-cylinder pressure and combustion timing. Following the model development, the experimental results of an H
₂
controller are given, demonstrating the utility of the control model outlined